Electric coal or rock drill



(No Model.) 11 Sheets-Sheet 1.

A I-I. I-I. BLISS.

- ELECTRIC COAL 0R ROCK DRILL.

No.,545,570. Patented Sept. 3,1895.

B116' dal mab 11 Sheets-Sheet 2.

(No Model.)

BLISS. ELEGTRIG GOAL 0R ROOK DRILL. No. 545,570. Patented Sept. 3,1895.

(No Model.) 11 Shets--Sheet- 3.

. H. H. BLISS.

ELECTRIC COAL 0R ROCK DRILL.

No. 545,570. Patented Sept. 3, 1895.`

par 7267@ Zw? @PMLMQ 11 shgetsheen 4.

(No Model.)v

H. H. BLISS.

ELECTRIC GOAL 0R ROCK DRILL.

Patented Sept. 3, 1895.

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H. H. BLISS. ELECTRIC COAL 0R RCCK DRILL. No. 545,570. Patentedsept.3,1895.

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51.V H. BLISS.

ELECTRIC COAL 0R ROCK DRILL.

150.545,570. 125.5511555 sept. s, 1595. L Q ,/Q'

Q o:l o fr@ @j J@ o 5;;:112 f v @l "S5 s@ f s" odel.) 1.1 Sheets- Sheet8.

H. H. BLISS.

ELECTRIC GOAL 0R ROCK DRILL.

510.5115570. Patented Sept. 3,1895..

11 sheeLs-shee.

(N25 Moda.)

H. H. BLISS.

ELBGTRIG GOAL 0R ROGKy DRILL.

Patented Sept. 3, 1895.

11 Sheets-Sheet Y 10.

(No Model.)

H. H, BLISS. ELECTRIC GOAL 0B. ROCK DRILL.

Patented Sept. 3, 1895.

(No Model.) 11 Sheets-Sheet 1.1.

H. H. BLISS. 5

ELECTRIC COAL 0R ROK DRILL.

\ No. 545,570. Patented Sept. 3,1895.

\\ iiiilimun l {umu-r .miti muuu: mm 1 G E I (if ZnI/f/Z'ovf UNrTEDSTATiEs PATENT' Ottica.

HENRY H. BLISS, OFVASHINGTON, DISTRICT OF COLUMBIA, ASSIGNOR TO JOSEPHA. JEFFREY, OF COLUMBUS, OHIO.

ELECTRIC COAL OR ROCK DRI LL sPncIFIcATIoN forming part of LettersPatent No. 545,570, dated september 3, 1895. ,Application filedSeptember 6. 1338. Serial No. 234,685.y (No model.)

To @ZZ whom it may concern,.-

Be it known that I, HENRY H. BLISS, a citizen of the United States,residing at Washington, in the District of Columbia, have ini Ventedcertain new and useful Improvements in Electric Coal and Rock Drills, ofwhich the following is a specification, reference being had therein tothe accompanying drawings.

Figure 1 is a side elevation of a drill embodying my improvements. Fig.1@ is a section of the edge portion of the upper fieldmagnet. Fig. 2 isa longitudinal section. Fig. 3 is a face view with the master-wheeldetached. Fig. 3a is a face view of the coveringf plate. Fig. 4 is aface View of the face-plate. Fig. 5 is a rear inside View of the same.Fig. 6 is a section on line en fr, Fig. 5. Fig. 7 is a section on'line yy, Fig. 4. Fig. 8 is an enlarged View of part of Fig. 6. Fig. 9 is asection on line z e', Fig. 1. Fig. 10 shows the master-wheel detached.Fig. 11 is a side view of the top` field-magnet. Fig. 12 is a side viewvof the bottom magnet. Fig. 13 is a front view of the armature. Fig. 14is a rear view of the armature. Fig. 15 is a section on the line x fr',Fig. 14. Fig. 16 is a longitudinal section of the connection-box on thedrill, taken on line 'y' fj, Fig. 17. Figf 17 is a plan View of Fig. 16.Fig. 18 is a front view of the trun- 50 nien-carrier detached. Fig. 19is a section on line z z', Fig. 1S. Fig. 20 is a face view of thedriving-pinion. Fig. 21 is a longitudinal section of a modilied form ofthe machine. Fig. 22 is a View from the rear of that in Fig.

21. Fig. 23 is a diagrammatic view showing one ot' the methods ofdistributing and supplying the current to machines. Fig. 24 is adiagrammatic view of one form of electric circuit and connections forthe machine..

4o Fig. 25 is a view, partly diagrammatic and partly complete, showingthe manner of supplying the current from the mains to theconnection-boxes and from the connection-boxes to two or more differingmachines. Fig. 26

shows the parts in Fig. 17 together with parts of the electric circuit.-Fig. 26a is a section on the line @c2 m2 of Fig. 26. Fig. 26b is asection on the line g2g/2 of Fig. 26. Fig. 27 shows in perspective oneof the parts of the handle 5o constituting a portion of the detachablesection of the circuit, the end of the hose or cable containing thewires being also shown. Fig.

28 is a perspective partly broken away, showing the outer side ot` onepart of the handle. Fig. 29 is a section through the handle. Fig. 55 30is a perspective showing the interior of one ofthe parts of the handle.Fig. 3l is a face View of the wall-box adapted to contain and protect.contact-pieces or exposed portions of the circuit at which electricconnec- 6o tion can be made at will. Fig. 32 isa section through thesame. Fig. 33 is a face view, Fig. 34 is a section, and Fig. 35 isasideview, of a modification of the motor. Figs. 36, 37, and 38 are similarviews of another form of 65 mechanism. Figs. 39, 40, and 41 arerespectively a rear View, a vertical section, and a plan view, ofanother modified form of machine. Figs. 42 and 43 are side elevation anda vertical section of another form. 7c

Referring at present to Figs. 1 to20, A represents a bit or boring toolproper inserted into the socket b onthe end of the threaded stem B, thelatter being provided with grooves at b to receive the gibs B', whichconnect the 75 stem B to the master-wheel C. The latter has atubularbearing part C', formed with grooves c c, into which are fitted the gibsB. When the parts are thus connected, the stem will be rotated by thegibs and the wheel and can So pass longitudinally through the wheel. Themaster-wheel is held by a clip c', the ange c2 of which engages with theflange CZ on the trunnion-carrier. (IndicatedasawholebyD.) Themaster-wheel C is driven by a pinion E on a shaft F. This shaft is inthis construction supported on the core Gr` of the fieldmagnet, it beingsituated on a line below the axis of said core, in order that as much aspossible of the iron composing the latter shall be 9o thrown well up'.At the outer end this shaft is supported in the face-plate H. The uppercore of the field-magnet comprises the said core G and the pole-piece G.The lower core of the magnet comprises the core I and the pole-piece 1.-The lower core of the fieldmagnet is used as the means for supportingthe drill-stem, the master-Wheel, and other parts to be described, ithaving a longitudinal aperture at 'i'. The pole-pieces are both roothrown somewhat up, and are concave, asshown,theirinnercurvedsurfacebeingstruck from the axis of the shaft F.To this shaft F is secured the armature. (Indicated as a whole by J.)Itis constructed, as shown, of a series (herein eight) of core-sections,(see Figs. 13 and 14,) each comprising a curved shank j, secured to orformed'with end pieces j. These end pieces have boltapertures throughwhich pass the fastening-screws f2. These sections are separatelywrapped with their wire and then placed together so as to form acomplete ring. The screws jg engage with a ring J', having a flange jlto receive them, a web j, and a hub j, which is keyed to the shaft F at,77. (See Figs. 13, 14, and l5.) The terminals 7'8 are inserted intometallic rodsj, and secured by screws jl() in the wellknown series toform a Gramme ring. These rodsj are passed through rubber or insulat`ing tubes ju, and are secured to the commutator-tlangesj12 on the frontside, (the contact partsj13 being fastened to a wooden or otherinsulating flange-sleeve at J2.) By preference the commutator-shaft ismounted in a brass or other non-magnetic bearingblock F2, fastened inthe core G. The armature and the commutator are entirely inclosed on theface side by means of the face-plate II and a supporting-ring H. Thelatter is held by screws at Zt', Figs. 2 and '7, to the upper and lowerpole-pieces. The face-plate II is held in place against the ring Il by aring H2, secured by screws h2, Figs. 3, 4, and 7, and partially overliesthe plate Il. The latter has a bearing h3, through which the outer endof shaft F passes.

Il4 indicates an adjusting-lever secured to the face-plate Il or its hubh3, and by means of it the plate can be adjusted into any desiredposition, this plate supporting the brushes, as will be described. Theplate after adjustment can be tightly locked in place by a screw andlever at 115, its threaded end engaging with the ring H2 and bearingagainst the plate ll. (See Fig. 7.)

The brush -holders are indicated by K. They project inward from theface-plate H and are supported thereon against insulating material at 7oby means of screws 7c. The brushes themselves are shown at K', beingclamped in the holders K K. To adjust the contact of the brushes uponthe commutator without removing any of the iixed parts, I employ movablepressure-blocks K2 K2. (See Figs. C and S.) rlhey are pivoted at 71:3 k3to theface-plate or parts secured thereto, and are formed of insulatingmaterial, such as rubber or hard wood. Adjusting-screws KS bear againstthem and are accessible on the outside of the machine. It will thus beseen that although all of the delicate and more or less dangerous partsof the machine are practicallyentirelyinclosed,all of the adjustmentsmainly required with electric mechanisms can be readily attained, suchas the'shifting of the brushes around the axis and the changing of theirpressure upon the commutator. These ends can be attained inways otherthan those illustrated in the details herein shown without departingfrom the spirit ofthe invention.

Each of the brush-holders is in contact with the metallic strip K4,resting against a curved contact-piece K5, there being two of the lattersupports upon the insulation at 706. (See Figs. and 6.) They areseparated from each other, and when one is in contact with one of thepieces K4 the other is in contact with the other. When the face-plate Ilwith the brushholders and the brushes is adjusted, the parts K4 sliparound but remain in contact with the metallic contacts K5, thuspreserving electric connection to the brushes. K( reprcsentsadjustablecontacts, one bearing against one piece at K5 and the other against theother. One of these contacts Ki is connected by the wire terminal 707with the coil G2 of the fieldmagnet. The other contact K'I is connectedwith the wire Zas. (See Figs. 5, 2G, and 2(32) This wire runs to acontact-piece Z, inclosed within a protecting holder L', fastened to theside of the lower polepiece. Below this wooden bloei( L there is aconnection-box, preferably of metal, having two chambers, one at L2 andthe other at L3. (See Figs. 1U, 17 and 26.) The contact-piece Z bearsagainst a contact Z', attached to a metal piece Z2, which is secured tospring-plate L, situated in the chamber L2 and supported againstinsulatingblock L5. On the other side of the insulation L5 there is asecond spring-piece L7, which hasa metallic connection with aswitch-lever L8, situated in the chamber L3 and pivoted at Z3, it havinga handle L9 projecting out from the chamber so as to be accessible. Thelever L8 can be moved to a contact Z, which is in' connection with acontact-plate Z5, projecting into the aforesaid wooden coveringblock L.It is adapted to be placed in contact with a plate Z, with which isconnected the terminal wire ai. It will now be seen that if thespring-plates L4 and L7 are in electrical connection with a generatorthe current can be caused to enter at the plate L7, and, if switch LEL94 is in contact with Z4, passed through said lever and the contacts ZlZ5 and wire @a to the coil l2, and thence through the minal 768 to theplate Z', and to the springplate L4 and back to the generator.

The devices for earryin g the current around the machine, it will beseen, are all entirely inclosed and concealed, and by having them soarranged l can prevent their being harmed and also avoid danger to anattendant.

The devices for taking the current to and from the parts LL7 will behereinbelowfully described. The upper and the lower cores of thefield-magri et are joined bya neutral piece M, which not only completesthe magnetic circuit, but is also utilized to support a number of theoperative parts of the machine. The

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drill-stem is advanced by means of divisible nut-sections N N,'mountedin a plate N',

bolted to or formed on the connecting-piece INI. This plate N. supportsthe lever N2, which opens and closes the nut-sections in a way readilyunderstood. The parts at fn. of the n ut-sections are brass, as is alsothe wheel-hub C. These parts support the drill-stem, and,

although the latter becomes powerfully mag-y netic, no friction results,as the magnetism therein does not affect these brass supports. At M M2,I have provided loop-handles for the machine, by which it can be'readilypicked up and manipulated, and by which, also, it can be held in theframe in any desired position after adjustment. The machine is soarranged that it can be adjusted upon a horizontal axis. At D there aretrunnions resting in vertically-adjustable trunnion-bars D2, adapted tobe clampedto the frame-bars D3. The trunnions D D areV cast with theaforesaid bracket-pieces D, which surround the sides and end of thelower pole-piece,having boltapertures at d for fastening'it thereto, andhaving an aperture d2 for the insertion of the Wheel-hub C. (See Figs.18 and 19.) g There is a short tube at d2, terminating in the flange d,with which engages the clip c to hold the master-wheel in place.

In Figs. 2l and 22 a somewhat modified form of machine is shown, inwhich the shaft F is mounted in a bearing F in the rear neutral pieceMinstead of the pole-piece G, which is bolted higher up on the neutralpiece M. The brush-holders are mounted on a collar K2 on the boss F2 andthe commutator-ring jl is placed in the rear of the armature, so thatmany of the small parts, contact-pieces, screws, dac., can be omitted,the principal features remaining the same.

For connecting machines with the mains extending from the generator, Iemploy 'a flexible hose or cable, it having an outer cover andprotecting jacket, and having within it one or more electric conductorsterminating in automatically-operating contacts adapted to be detachablyconnected with counterpart contacts secured to the machine or to thedevices which support it. This part of the invention will be readilyunderstood by a more particular reference to Figs. 25 to 32, in con.-nection with the above-described Figs. l, 3, 9, 16, 17, and 26. Oindicates rubber hose, of which for each piece enough is taken to reachfrom the terminals of the mains on the neighboring Wall, as will bedescribed, to all points where the machines will be ordinarily situated.Through these are passed the wires or the conductors o o', and for somepurposes additional wires, as at o4. These Wires may be twisted togetherand braided with or otherwise covered by fibrous material, so as to forma cable. Rubber hose, however, is preferable for many reasons, amongwhich is the fact that these conductors are constantly ly- .ing -on theground,which is liable to charge the ordinary cable material'with dirtand foreign materials, which would be disastrous if they found access tothe interior conductors. The hose effectually guards against abrasionofV thev conducting surfaces, and the attendants are perfectly safe fromcurrent in manipulating them. The hose terminates in parts which are teeffect an attachment to the wall-terminals. O2 O2 are twoinsulatingpieces, preferably of hard wood. formed an aperture, as at O8,adapted to receive the end of the hose or cable. They can be firmlyclamped together, so as to constitute a handle-piece. In the outer endthere is a chamber, in which are placed two contactpieces O4 O5. Thewire o is fastened to one and the Wire o to the other. As shown in someof the figures, there is a third wire inclosed in the above-describeddevices, this wire being adapted to be so connected as to constitutepart of a shunt-circuit for resistance, for lighting, or other purposes.It is indicated by 04and is connected to a third contact O, which, forreasons that will be readily understood, can be on the outside of thehandle; but it also may be inclosed, if desired. At the other end of thehose or cable there is a handle-piece having parts corresponding tothose above described. Its outer end is adapted to bethrust into andheld tightly in the above-described contact-box L2. When it is in place,the contacts it contains come, respectively and automatically, intoconnection with the contacts L4 L7 in said box.

Figs. 25, 31, and 32 show the manner of attaching the portableconductors to the machines and to the wall-terminals, and Figs.-

23 and 24 illustrate, diagrammatically, the complete circuits from thegenerator to the machines, lights, dac. Q Q Q2 indicate three wires fromthe generators, they being arranged relatively to the latter and to eachother in the well-known Way. They are carried through and supported inthe entries, rooms, &c., in the mine in any suitable manner. At R theyare connected tolights which are independent of the machines. They arealso connected to the wall-terminals for supplying the machines. Toprovide the latter I employ one or more, preferably several, boxessituated permanently at places near which power is to be applied. Theymay be made of any suitable material. I employ metal boxes provided,where necessary, with insulating material. They are indicated by P, Fig.32, insulation being shown at P. Several boxes are cast together andhave base plates for securing them to the Wall of some stationarysupport. Each box contains one or merev contacts, as at p p', each inelectric In them is IOO IIO

connection with binding-posts, as at 192133. When a shunt-circuit isemployed to connect with a wire, such as at o4, in the hose or cable,there should be a third contact in the wall-box. Those at p and p arefor the incoming and outgoing main current. The wires Q Q' Q2 havebranches q q q2, which are connected to the posts at p2 p3 in the propermanner. Preferably also switches, as at g3, are interposed in eachbranch, although not necessary. At Q3 are fusible safetyplugs, each ot'which limits the total current passing through its branch, and thenpreferably there are at Q4 plugs of less capacity to govern the currentto each machine. From the three wires currents of different tension canbe taken, and if said wires be properly connected they can be soarranged as to de liver through the different boxes different currentsfor varying machines. Thus in Fig. 25 two machines are indicated, ofwhich one and its current-supplying devices are so arranged as to take ahigher current, and the other and its connections are disposed so as totake a lower, the machine at the left of the figure being of the natureof a drill such as shown in the figures above described, and the onebelow being a larger machine for undercutting. Referring to Figs. 23 and24, the different paths which the current can be caused to take will beunderstood. At R -are shown lights placed in a shunt-circuit includingthe armature terminals and the above-mentioned Wire o4 in the hose.Should the current passing through the machine exceed the desired limitit will be shunted to these lights at R, and can therefore be utilizedfor lighting the mine or other locality where the machines are used.Instead of lights at R a resistance can be employed to regulate theoperation of the machine. In either case it will be seen that no partshave to be manipulated by the attendants beyond inserting the handlesot' the hose or cableinto their respective boxes.

In Fig. 2/1 there is a diagrammatic illustration of the use of theshunt-circuit around the field of the machine.

In Figs. 3l and 32 the wall-terminal box is shown as arranged with thecells horizontally disposed. The top wall is extended to provide awater-shed, and, to prevent the entrance of water or moisture or foreignmatetials when the boxes are out of use, a door I"L is employed whichtightly incloses the contacts within it.

In the construction in Figs. l to 2 the cores of the field-magnet arearranged, as will be seen, one above the other, and both substantiallyhorizontal, they varying somewhat from the latter position underdiffering adjustments; but they are, by reason of this arrangement,always both on lines between the side bars B3 of the supporting-frame.Hence the machine, as a whole, can be inade narrow and the partsarranged compactly. It will be further seen that by arranging thearmature and its shaft so that their axis is out of line with the axisof the field-magnet which supports them, the core of the latter can bethrown relatively up or away from said axis, so that the metal thereofshall be more nearly in line with the polepiece. This arrangementissuperior to that I have heretofore followed of having the axis of thearmature-shaft coincide with that of the core which supports it.Moreover, by having the axis of the armatureshaft above the midway linebetween the axes of the cores thelowerpole-piece can be thrown up insuch way that the lower core can be utilized to advantage inthe waydescribed for supporting one or more ot' the driven or operative parts.The magnet is so disposed that it acts to close and protect thepole-chamber on one side of the armature, the above-described closingdevices I-I II Il2 serving a similar purpose on the opposite side. Theconstruction in Figs. 1 and 2 is similar to that in Figs. 2l and 22, inthat the brushes lie between the first plane of the armature and theneutral connecting-piece M ofthe field, which latter serves also toassist in inclosing the smaller parts and in supporting the driven oroperative parts. I herein speak of the contacts on the machine, those onthe wall, and those in the portable conductor as being automatic,meaning thereby that when one of them is caused to approach itscounterpart there is an engagement of them together caused withoutrequiring special manipulation.

In Figs. 33, 84, and 35 a mechanism is shown which also embodies many ofthe features above described. In this case the drill is not supporteddirectly upon trunnious, though it is vertically adjustable bodily onthe supporting-frame G3. The field-magnets are here arranged verticallyand are provided with guideways to receive the frame-bars. In machinesof this sort it is desirable to have all of the parts arranged ascompactly as possible, and the frame G3 G3 should be as narrow aspracticable in order to give it the proper' strength. By passing theframe-bars through the motor they can be kept comparatively closetogether and the motor can be allowed to extend laterally as far as isnecessary to provide parts of sufficient size to provide the requisitepower. The drill-stem B in this case is situatedtransversely to thefield-magnets, but passes between them, it being mounted in a bearing atB3 on one of the neutral bars or plates M. The armature is here mountedin a way substantially similar to that provided in the construction inFigs. l and 2, except that its shaft is at the inner end supported in aplate or bearing F2, secured to the pole-pieces. The brushes can beconstructed, supported, and adjusted as in `the construction abovedescribed, or in any other preferred way.

The machine shown in Figs. 36, 37, and 38 is mounted upon trunnions, sothat it can be vibrated in its supporting-frame, the trunnions beingsomewhat diierent from thosein IOD lIO

the mechanism in Figs. 1, 2, and 3, in that they lie on a line passingthrough the frame-bars, this being possible here because of such adisposition of theV parts of the motor that it is balanced on theaforesaid line that intersects the frame-bars. The master-wheel C inthis case has external instead of internal teeth, and the drill-shaft issupported in a bearingat the end of one of the field-magnets and on aline in the plane of, but transverse to, the longitudinal axisof themagnet. The trunnions are formed upon or secured to metal plates,preferably brass, which are fastened to the pole-pieces of thefield-magnets andwhich also act to connect said magnets and mutuallysupport and brace them.

In Figs. 39, 40, and 41 a mechanism is shown having many features ofconstruction and arrangement similar to those above described; but itdiffers from the other forms, namely, in this that the armature-shaftand drill-shaft are on the same axis, the former being hollow and thelatter. passing through it. The

' armaturepinion E transmits power through intermediate wheel or wheelsE3 to the master-wheel C. The latter engages with the -grooveddrill-stem and has its hub C mounted G16, I, and has at one end a pinionE, engaging with and driving the masterwheel C, which is mounted inbearing` D and nut N at one side. rlhe armature is held in-place bysupports N3, bolted to the part I.

I do not in this case claim the combination of a rotatingandlongitudinally-feeding drillrod, a support therefor, an electric motorhaving a rotating armature-shaft on said support,

gearing between said armature shaft and' 4drill-rod, feeding mechanismfor the drill-rod,

and devices for disengaging the feeding mechanism from the drill-rod toadmit of a quick return of the drillrod independent of the feedingmechanism, as that matter constitutes the subject of a claim in anotherapplication, filed by me December 24, 1896, Serial No. 222,524.

1. An electric drill or analogous machine,

.having in combination, a field magnet, a rotary armature, an armatureshaft having its` bearings on one part of the field magnet, alongitudinally movable driven shaft having its bearings on another partof the field magnet, and a driven wheel concentric with the last saidshaft and mounted independently thereof in fixed relationswith the fieldmagnet, substantially as set forth.

2. An electric drill or analogous machine, having in combination, afield magnet, a rotary armature, an armature shaft mounted onv one partof the field magnet, and having a driven shaft mounted on another partof the field magnet parallel with the armature shaft and situated to lieacross the planes pf the armature, whereby said driven shaft can beelongated Without unduly elongating its supporting connection by whichit is held to the motor, substantially as set forth. v

3. In an electric drillor analogous machine, the combination of a fieldmagnet, a rotary armature, an armature shaft, a driven shaft having abearing in front of the armature and a bearing in rear of the armature,all the aforesaid parts being connected together as a unitary structurewhich is vibratable or axially adjustable, a supporting frame for saidstruct ure adapted to be made stationary, and an axial supportinterposed between the said frame and structure, substantially as setforth.

4. In an electric drill or analogous machine, the combination of' theiield magnet, the armature, and the armature shaft mounted at one end inone of the cores of the field magnet, and the other end mounted in abearing secured' to the pole piece of the field magnet, substantially asset forth.

5. In an electric drill or analogous machine, a field magnet having twoparallel cores, an

,armature shaft mounted in one of said cores and out of line with theaxis thereof and a driven shaft mounted in the other field core,

vices, and the driven mechanism geared to the armature shaft andsupported on the field magnet, substantially as set forth.

7. In an electric drill or analogous machine, the combination with thefield magnet, of the trunnions supporting the field magnet, the powermechanism, andthe driven mechanism, connected to said field magnet,substantially as set forth.

8.` In an electric drill or analogous machine, the combination of thefield magnet, the armature, the trunnion or hinge like support whichcarries the field magnet, and the stationary frame which supports saidtrunnion, substantially as set forth.

9. In an electric drill or analogous machine, the combination of therotary armature, a

field magnet having two poles adapted t-o lie either in a vertical lineone above the other, or in lines inclined to the vertical, and the axialsupport for the said magnet bodily movable vertically, substantially asset forth.

l0. In an electric drill or analogous machine, the combination with theportable frame IOO IIS

adapted to be made stationary, of the field magnet adjustable verticallyon said frame, the armature, the armature shaft, and the pole pieces ofthe field magnet having the armature shaft at their axis and arranged tovibrate to have said axis horizontal or inclined to the horizontal,substantially as set forth.

l1. In an electricdrill,oranalogous machine, the combination with thestationary frame, of the field magnet supported in said frame, thearmature, the driven shaft supported on said magnet, and the meanssecured to said magnet for advancing the operative parts, substantiallyas set forth.

12. In an electric drill or analogous machine, the combination of thearmature, the armature shaft, supported as set forth to be adjusted invertical planes around a horizontal axis, the field magnet, the mainsupporting frame for said magnet, and the driven shaft mounted in xedrelations to the armature shaft and adjustable axially therewith,substantially as set forth.

I3. In an electric drill oranalogous machine, the combination of theframe, the field magnet, the operative parts, the power transmittingdevices on one side of said magnet, and the advancing mechanism on theother side, substantially as set forth.

14. In an electric drill oranalogous machine the combination of theframe, the field magnet, the armature supported thereon, one of thecores of said magnet having an aperture, the driven part passing through said aperture, and the power transmitting devices, substantiallyas set forth.

l. In an electric drill a field magnet, having attached thereto thedriven shaft, the de vices Which support the magnet, and mechanismactuated bythe motor for advancing the operative parts of the drill,substantially as set forth.

16. In an electric drilloranalogousmachine, a field magnet having thedriven shaft passed through it, the wh eel which actuates said shaftmounted on said magnet and means for holding said Wheel in placerelativelyto said magnet independently of the driven shaft,substantially as set forth.

17. In an electric drill or analogous machine, the combination of thefield magnet pole pieces the armature between them, the closing devicesfor the chamber between the pole pieces, the armature shaft passingthrough said closing devices, the commutator and the adjustable brushesinside of said chamber, and means outside thereof connected to thebrushes for adjusting them, substantially as set forth.

1S. In an electric drill or analogous machine, the combination, with thepole pieces and the armature mounted between them of the commutatorinside of the outer plane of the armature, the adjustable brushes alsoinside of said plane and devices for closing'the chamber formed in thearmature, substantially as set forth.

I9. In an electric drill oranalogousmachine, the combination with thefield magnet pole pieces, andthe armature mounted in the chamber betweenthem of the closing devices for said chamber, the armature shaft havingone end supported directly in a core of the field magnet, and having thepower wheel outside of said closing devices, substantially as set forth.

20. In an electric drill or analogous machine, the combination With thefield magnet having pole pieces,the rotaryarmature between them, and thecommutator, of the protecting Wall formed with orsecured to the fieldmagnet and extending to or beyond the outer lines of the commutator, andthe armature shaft having a bearing directly in the metal forming thefield magnet, whereby the parts are reduced, and the commutator andbrushes are protected when the motor is being carried, substantially asset forth.

2l. In an electric drill oranalogous machine, the combination with thefield magnet having pole pieces, the rotary armature between them, andthe armature shaft having a bearing directly on the metal forming partof the magnetic circuit of the field magnet of the plate or shield infront of the pole pieces and armature, and having thearmature shaftpassed therethrough, substantially as set forth.

22. In an electric drill or analogous machine, the combination with thefield magnet pole pieces, the armature mounted between them, the partsdriven by the armature and supported on the field magnet, and theneutral pieces of the field magnet, arranged to assist in supporting theoperative parts ofthe machine, substantially asset forth.

23. In an electric drill or analogous machine, the combination with thefield magnet pole pieces, and the armature, of the closing de vices infront of the armature, the adjustable brushes in the pole chamber, thestationary electric conductor inside of said chamber and connected Withthe brushes, substantially as set forth.

24. In an electric drill or analogous machine, the combination with thepole pieces and the ICC IlO

armature, of the brushes and the commuta`-`- the combination with thefield magnet pole pieces, the armature having its shaft parallel to theaxis of the field helices, and the neutral or connecting piece of theield magnet, of the brushes mounted between the front plane of thearmature, and said neutral piece, and means for adjusting the brushes,substantially as set forth.

27. In an electric drill or analogous machine, the' combination with thefield magnet, the commutator, and the armature, of the closing devicesin front of the armature, the brushes inside thereof and the separableelectrical contacts inside thereof, substantially as set forth`.

28. In an electric drill or analogous machine, the combination with the`field magnet, and the armature, of the front bearing for the armature,the wheel outside of said bearing, the driven shaft mounted on one coreof the magnet, and the gearing interposed between said wheels and thedriven shaft, substan,

tially as set forth.

29. In an electric drill or analogous machine, the combination with thefield magnet, the commutator, and the armature, ofthe closing devices infront of the armature, the adjustable brushes, and the wheel on thearmature shaft outside of the said closing devices, substantially as setforth.

30. In a portable electric drill or analogous machine, the combinationof the portable supporting frame, the iield magnet secured thereto, thearmature, the armature shaft, the field magnet and armature beingprovided with wire helices having two insulated terminals external tothe aforesaid parts and a detachable conductor section having at its endtwo insulated terminals adapted to be detachably connected to theaforesaid external terminals, substantially as set forth.

3l. In aportable electric drill or analogous machine, the combinationwith the movable and adjustable eld magnet, and the driven parts, of thecontacts secured thereto, and a detachable portable conductor sectionhaving at its end two mutually insulated terminals each surrounded by aninsulating or protecting casing, and said portable conductor beingadapted to be detachably connected to supply mains, substantially as setforth.

32. In a portable electric drill or analogous machine, the combinationwith the driven parts, of the movable and adjustable field magnet, theportable frame, the contacts supported thereon, the inclosing devicesfor said contacts, and the portable contacts adapted to be engagedtherewith, substantially as set forth.

33. In a portable electric drill or analogous machine, the combinationwith the driven parts and the portable field magnet of the contactssupported thereon and a portable conductor section having at its endmutually insulated contacts surrounded by a protecting casing andcorresponding with the aforesaid contacts, and the switch supported onthe magnets, substantially as set forth.

34. In a portable electric tool of substantially the characterdescribed, the combination of the following elements, namely an electricmotor having a rotating armature and a field magnet, a portable frame,the adjustable connecting devices for attaching the motor to the framein dilerent positions vertically, a trunnion or hinge like supportinterposed between said vertically adjustable connecting devices and themotor and adapted to permit the motor to be adjusted axially, the rotarydriven shaft geared to the armature and connected to the field magnet bybearings holding it in a fixed line in relation thereto, and adetachable electric conductor section or cable having insulated contactsor circuit sections and adapted to be attached to said motor and conveycurrent thereto irrespective of the vertical or axial positions to whichit is adj usted on said frame or trunnion, substantially as set forth.

In testimony whereof I affix my signature in presence ofl two witnesses.

HENRY II. BLISS.

Witnesses:

GEO. A. HOWARD,

BURTIs W. SoMMERs.

Correction in LettersPatent No. 545,570.

It is hereby certified that in Letters Patent No. 545,570, grantedSeptember 3, 1895, upon the application o1" Henry H. `Bliss, ofWashington, District of Columbia, for an improvement in Electric Coal orRook Drills, an error appears in the printed specification requiringcorrection as follows: In line 57, page `5, the date, December 24, 1896,should read December Q4, 1886 ,-1 and that the said Letters Patentshould be read With this correction therein that the same may conform tothe record of the case in Vthe Patent Ooe.

Signed, countersigned, and sealed this 10th day of September, A. D.1895.

[sEAL-] JNO. M. REYNOLDS,

Assistant Secretary of the Interior. Countersigned:

S. T. FISHER,

Acting Commissioner of Patents.

It is hereby certified that in Letters'Patent No.545,570, grantedSeptember 3, 1895, upon thexapplication of HenryH. Bliss, of Washington,District of i Columbia, forv an improvement in Electric Coal or RockDrills, an error appears in the printed specication requiring correction.as lfollows: In line 57, page 5, the date, December 24, 1896, shouldread December 24, 1886 ,-1 and that the said Letters Patent should beread with this correction therein that the same may conform to therecord of the casein 'the Patent office.

Signed, countersigned, and seale'dfthis 10th day of September, A. D.1895.

[SEAL] JNO. M. REYNOLDS,

Assistant Secretary of the Interior. Countersigned:

S. T. FISHER,

' Acting Commissioner of Patents.

